Mazda's New Straight-Six Appears In Patents; Might Power The 'RX-9'

The SkyActiv-X inline-six inadvertently confirmed by Mazda last year can be seen in these patent drawings along with a new eight-speed automatic gearbox
Mazda's New Straight-Six Appears In Patents; Might Power The 'RX-9'

Mazda is not like other car companies. While other manufacturers have obsessed with downsizing - a move which has backfired to an extent - it has stuck to a principle of ‘right-sizing’. Instead of making ever smaller engines with turbochargers, Mazda likes much larger, usually naturally-aspirated engines.

Now though, the Japanese firm is taking this ethos a step further, by making an engine much larger than anything it currently builds. As accidentally confirmed by a financial results report published - and subsequently removed - on its website last year, Mazda is building an all-new inline-six. And although news on that front did go quiet for some time after the initial report, the engine has now appeared in some patent drawings.

Mazda's New Straight-Six Appears In Patents; Might Power The 'RX-9'

The accompanying text for the images - uncovered by Japanese publication T’s Media - seems to suggest the new straight-sixes will be scalable. “Provided is an engine exhaust structure capable of securing exhaust efficiency while reducing the size of the engine by changing the structure of an exhaust port,” they say (translated from Japanese via Google).

When Mazda originally let the six-cylinder cat out of the bag, it mentioned SkyActiv-X branding. That means the engines are set to use spark-controlled high-compression ignition for a leaner burn, and there won’t be any turbochargers. Existing inline-four SkyActiv-X engines do use a tiny pump to push extra air into the engine, which could be described as a supercharger - so whether or not the new sixes can be considered naturally-aspirated is up for debate.

Mazda's New Straight-Six Appears In Patents; Might Power The 'RX-9'

The engines will be used by a new range of predominantly rear-wheel drive ‘large architecture’ cars, one of which is set to be a new Mazda 6 saloon. 48-volt mild hybrid and full plug-in hybrid options are on the agenda, as is a diesel version.

More recently, it’s been rumoured that the engine and the platform will be used for the mythical ‘RX-9’. Yep, the RX-7/RX-8 successor will use a six rather than a rotary engine, according to Jalopnik.

Mazda's New Straight-Six Appears In Patents; Might Power The 'RX-9'

A patent for a new eight-speed automatic gearbox has also been filed by Mazda. While inevitably of less interest than the engine, its development is good news given that the company currently has to make do with a relatively old six-speed auto.


Nishant Dash

Two patents separately, great.
If both are designed for the same car, A N G E R Y

02/06/2020 - 11:02 |
23 | 0

if u dislike this u prob cant afford rotari

02/06/2020 - 11:03 |
9 | 1

Why do I feel like this is going to be the A90 Supra all over again?
“iT’s NoT a ReAl Rx!!!!!!!!!!!!!!!!”

02/06/2020 - 11:29 |
21 | 0

R in RX stands for Rotary my dude.
This is probably an MX or something like that.

02/06/2020 - 18:50 |
11 | 0
RWB Dude

I mean the R in RX stands for rotary sooo…

02/06/2020 - 11:52 |
10 | 1

If Mazda was any other manufacturer the new “RX-9” would be an electric SUV. If they make a fun car using a unique power train (skyactiv-x may not be as unique as a rotary, but still something different) I will still be happy!

02/06/2020 - 15:04 |
13 | 1

Yeah, I don’t think this is really for the RX but perhaps there’s going to be some sort of model of it where it’s the same car but just that engine instead of the rotary

02/06/2020 - 15:50 |
4 | 0

I have a hypothesis; I might be right, I might be not. I think the car we’re talking is not the RX, but a possible revival of the MX-6. why?, I found an article where these guys trademarked the Name MX-6
( Source: So I can be a possibility I guess, and probably the next generation of the 6, will also debut this new engine.

02/06/2020 - 16:30 |
14 | 0

An MX-6 would be a very welcoming move. But where exactly would it stack up in the Mazda line up?

02/07/2020 - 06:17 |
1 | 0
Joel Lundin

Wouldn’t that make it the mx9?

02/06/2020 - 17:40 |
3 | 0
Matthew Henderson

Hm. Yes. I want. Mazda, please give us this. Although, if I might add something, I think Jalopnik meant that Mazda is going to use the basis of what was originally intended to be the RX9 to make a 2-door GT/sportscar with a 6-cyl Sky-X.

02/06/2020 - 22:42 |
0 | 0

Wasnt it said by mazda that the next Mazda 6 would get a 3.0l inline 6? So it would be for that if im not mistaken

02/07/2020 - 08:22 |
1 | 0

Incorrect. It’s for the upcoming Mazda 6 rwd

02/07/2020 - 19:45 |
0 | 1

In reply to by Anonymous (not verified)

Maybe double check your info 😂

02/07/2020 - 19:47 |
0 | 1

“I’ll take the Diesel option for 300 Alex”

02/07/2020 - 22:10 |
1 | 0


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